$iffarfield

$iffarfield is a command to calculate the far-field after solving the cavity mode. The format is

$iffarfield
ifadjustsize xlen_ff ylen_ff xnum_ff ynum_ff

ifadjustsize=1 is to decide whether set the size of output window by yourself, else it will use the default size :

xlen_ff = 500.0e-4 (cm)
ylen_ff = 500.0e-4 (cm)
xnum_ff = 201
ynum_ff = 201

Example:

$iffarfield
1 400.0e-4 400.0e-4 101 101

or

$iffarfield
0